Okay Keith is trash for practically attempting to rape Yeonwoo whenever he feels like it but Yeonwoo is a fool for trying to hide it from Keith. It will only bring more problems.
I cant believe Keith hasnt considered for a second that Yeonwoo marked him. Keith knows that in his rut he would have gone to someone that would satisfy him best, markings are also suppose to make them draw to each other so they should feel it.
It's like people in this story never consider options and jump to the most pessimistic assumption. Ofcourse someone is going to get flustered if porn pops out all of the sudden.
This man has an amazing talent that could be used to make millions of dollars but he chooses to run a coffee shop